Print-in-place Simplest Marble Machine. Marbles are moving by raising the box.

Very SATiSFYING fidget.

Printed in one piece without supports.
It can be scaled up much as you want (the limit is your printer capabilities).

Use you own balls or marbles or print one (included).
I recommend balls 12-18mm. 16mm is optimal for original size.

Files include textured round box and plain, so you can add your own text or logo.